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Physical & Chemical properties

Vapour pressure

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Administrative data

Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
december 15, 2005 - February 21, 2006
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP study according to OECD guideling 104, OECD 113 and EU method A.4

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2006

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Qualifier:
according to
Guideline:
other: OECD 113 (Screening test for thermal stability and stability in air)
GLP compliance:
yes (incl. certificate)
Type of method:
effusion method: vapour pressure balance

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Purity: Technical grade
Molecular weight: 63.55 g/mol (copper) ; 284.48 g/mol (stearic acid) ; 632.2 g/mol (zinc stearate)

Batch-No.: 508131
Identity: not available
Purity: not available
Additive: approx. 0.6% zinc stearate / 0.9 % stearic acid



Certificate No., date: Product description in the test order of GAB Biotechnologie GmbH & GAB Analytik GmbH dated October 25, 2005

Storage conditions: Ambient temperature (10-30 °C), dry

Expiration date of the certificate: October 10, 2006

Results and discussion

Vapour pressureopen allclose all
Temp.:
20 °C
Vapour pressure:
7.5 other: nanopascal
Remarks on result:
other: the calculated vapour pressure values are extrapolated with the Antoine constants from the regression of the data below 140°C (data points 1-8) for temperature 20,25 and 50 °C
Temp.:
25 °C
Vapour pressure:
18 other: nanopascal
Remarks on result:
other: the calculated vapour pressure values are extrapolated with the Antoine constants from the regression of the data below 140°C (data points 1-8) for temperature 20,25 and 50 °C
Temp.:
50 °C
Vapour pressure:
840 other: nanopascal
Remarks on result:
other: the calculated vapour pressure values are extrapolated with the Antoine constants from the regression of the data below 140°C (data points 1-8) for temperature 20,25 and 50 °C

Any other information on results incl. tables

The measured vapour pressures are descended from the additive of the test item. Above 140°C the course of the vapour pressure shows an untypical profile. This could be explained with the volatile additives of the test item.

The measured vapour pressure of the test item decreases at higher temperature (the vapour pressure at constant temperature e.g. 150°C decreases over time). This indicates that the measured vapour pressure cannot be related to the pure test item but it is caused by mass limited additives, contained in the test item. This explains the constant or decreasing vapour pressure at higher temperatures > 140°C

Due to this only the vapour pressure data < 140°C (data points 1 -8) are used for the calculation of the regression and to determine the Antoine constants A,B and C.

Applicant's summary and conclusion

Conclusions:
Good quality study. The calculated vapour pressure values are 7.5e-9 Pa (20°C), 1.8e-8 Pa (25°C) and 8.4e-7 Pa (50°C).
The sudy is applicable to the coated copper flakes only